After 10+ years of Poser-ing, I have ventured into the Setup room for the first time, and promptly regretted it...

I really really want to rig this figure from my favourite game. I was going to model it anyway, but then discovered that there are dozens of them for free at Thingiverse, so I picked the best one, and am now trying to frankenstein something akin to a poseable figure. I copied a rig from a somewhat similar character, and after some adjustment, it actually works pretty well from the feet and up - until the head, which is a disaster zone. Side or twist, the mesh splits open, bend, it stretches one row of polygons and the rest remain unaffected. I'm thinking it may have something to do with that one big bone up there? Also, I made the face and the eyes separate groups, but they have no bones. I mean to make morphs for the eyes.

Basically, what I'm saying, can anyone help?

Please?